Martinelli, Antonio EduardoSilva, Camila Renata Ferreira da2022-03-032022-03-032022-02-17SILVA, Camila Renata Ferreira da. Influência da alta pressão na síntese hidrotérmica de zircônia (ZrO2). 2022. 53 f. Trabalho de Conclusão de Curso (Graduação em Engenharia de Materiais) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/46382The development of new materials from new compositions occupies considerable space in the field of materials science and engineering. However, promoting changes in already known materials or even establishing adaptations of already established processing techniques presents a huge potential for innovation and effect in the industry. The hydrothermal synthesis method is sometimes considered obsolete, but modifications of the technique can allow obtaining materials with modified characteristics. This work promoted the hydrothermal syntheses of zirconium oxide with adaptation for pressure control by injecting innert gas and verified its effect on crystallographic and microstructural characteristics of the nanostructured produced materials. In addition, a calcination treatment was carried out to verify its effect on the characteristics of the materials. Traditional synthesis with autogenous pressure produced, according to X-ray diffraction (XRD) and scanning electron microscopy (SEM-FEG) analysis, nanoparticles composed of cubic and monoclinic phases, while gas injection promoted the formation of monoclinic and tetragonal phases even without the addition of dopants and at only 180°C for 20h. Calcination produced a total stabilization of the monoclinic phase in all samples, in addition to causing an increase in crystallite size due to the occurrence of diffusive processes typical of the sintering phenomenon.Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/Síntese hidrotérmicaZircôniaCalcinaçãoHydrothermal synthesisCalcinationbachelorThesis